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Cheaper#76,890 N Main St, Manteca,Califonaa December Z2,1995 Page 4 • 11, Q322 =Q0010ay • February 25, 1987 Two steel 10,000 gallon gasoline tanks, piping and pumps are removed. Six soil samples obtained reveal up to 112 ppm TPH-g, 0 030 ppm benzene in the soil. Analysis for EDB, diesel, kerosene, motor oil and C9 to Cab compounds were non-detect • March 2-3, 1987 Three Monitoring wells installed by Kleinfelder, no soil sample results are included. Only benzene is found, 3.5 ppb in MW-1 and 13 ppb in MW-3. • March 19, 1987 Tank pit is overexcavated, three soil samples obtained, one shows 31 ppm TPH-g at 15' BGS. • May 27, 1988 Three wells sampled by IQeinfelder, all non-detect for TPH g and BTEX. • October 24, 1990 Three wells sampled by Dames and Moore, all non-detect for TPH-g and BTEX • September 6, 1991 A fourth well was installed by Parker Environmental, all Ssoil samples from boring are ND September 11, 1991 Groundwater is sampled from four wells, all non-detect for TPH-g and BTEX • October 15, 1991 Pump test by Parker Environmental indicates shallow aquifer connected • January 10, 1992 MW-4 sampled, non-detect for TPH-g and BTEX • May 19, 1992 Four borings advanced to depths of 15-19 feet BGS and sampled for TPH-g and BTEX. One sample from 2 5' BGS showed 2.5 ppm TPH-g, and less than one ppm each of toluene, ethylbenzene and xylenes. Benzene was not detected Other seven samples were non-detect for TPH-g and BTEX. A groundwater sample from MW-4 was ND for TPH-g and BTEX. • March 17, 1993 Four monitoring wells sampled, all ND for TPH-g and BTEX • July 1, 1993 Four monitoring wells sampled, all ND for TPH-g and BTEX • • September 23. 1993 Four monitoring wells sampled, all ND for TPH-g and BTEX Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 Phone (510) 439-1024 Fax (510) 439-2566